Stir together cheeses, mayonnaise or salad dressing, corn, chili peppers, chipotle chili peppers, and garlic powder in a large mixing bowl. Spread mixture into a 9-inch quiche dish, shallow 1-quart casserole, or 9-inch pie plate. Cover and chill up to 24 hours. Combine tomato, green onion, and cilantro. Cover and chill up to 24 hours.
To serve, bake cheese mixture in dish in a 350 degree oven about 25 minutes or until heated through. Spoon tomato mixture in the center. Serve with vegetable dippers and tortilla chips. Makes 28 servings.
The fresh tomato topping provides a cool contrast to the spicy dip.